Spring lock bolt



Dec. 6, 1938. D s 2,138,843

SPRING LOCK BOLT Filed Nov. 16, 1957 INVENTOR.

ATTORNEYS.

Patented Dec. 6, 1938 UNITED STATES PATENT OFFICE SPRING LOCK BOLT NoelDupuis, Seattle, Wash.

Application November 16, 1937, Serial No. 174,873

1 Claim.

This invention aims to providea simple but effective means for attachinga door knob to a shaft, without resorting to the usual screw employedfor connecting those parts.

It is within the province of the disclosure to improve generally and toenhance the utility of devices of that type to which the presentinvention appertains.

the invention. In the accompanying drawing:

Fig. 1 shows in top plan, a device constructed in accordance with theinvention;

Fig. 2 is a side elevation wherein parts are sectioned away;

Fig. 3 is a transverse section on the line 3-3 of Fig. 1;

Fig. 4 is a transverse section similar to Fig. 3

but showing a modification.

The numeral i marks a door knob having a shank 2 provided with a bore 3for the reception of one end of a shaft 4. The shank 2 is supplied witha transverse guideway 5 aligned axially with a transverse seat 6extended, preferably,

entirely through the shaft 4.

In the guideway 5 and in the seat 6 is mounted a smooth, cylindrical,freely slidable holding pin 1. To the outer end of the pin I, a curvedgripping spring 8 is secured. The spring 8 extends far enough around theshank 2 to hold the pin 1 in place, as shown in Fig. 3.

Because the seat 6 extends entirely through the shaft 4, the pin 1 maybe engaged in the seat on opposite sides of the shaft 4.

The pin 1 terminates within the seat 6.

The

pin, therefore, is shortened, and the pin may be inserted into theguideway 5 and into the seat 6 with a minimum amount of flexing in thespring 8.

In Fig. 4, parts hereinbefore described have been designated by numeralsalready used, with the suffix a. The form shown in Fig. 4 ischaracterized by the fact that the spring 8a has an outwardly projectingbend 9, located close to the pin la and enhancing the resiliency of thespring, most of the bending of the spring, when the pin la is insertedinto the guideway 5a and into the seat 6a, taking place close tothe pinla. The bend 9, moreover, tends to prevent the end of the spring 8a.from being broken loose from the end of the pin la. If desired, theoperator can close the bend 9, with a pair of pliers or the like, asmuch as is desired, in order to enhance the grip of the spring 8a on theshank 2a.

The device is simple in construction, in either of its forms, and doesaway with the screw commonly employed to connect the shank of the doorknob to the shaft. Moreover, it is unnecessary to thread either theguideway 5 or the seat 6.

Having thus described the invention, what is claimed is:

In a device of the class described, a door knob including a shank havinga longitudinal bore and provided with a transverse guideway, a shaftinserted into the bore and having a transverse seat aligned with theguideway, a locking pin mounted in the guideway and in the seat andlongitudinally slidable therein, and a curved spring secured at one endto the outer end of the pin and extended far enough around the shank tohold the pin in place, the spring having an outwardly projecting bendlocated close to the pin and enhancing the resiliency of the spring, thebend being capable of being closed together to such a degree as toenhance the grip of the spring on the shank.

NOEL DU'PUIS'.

